text: /*****************************************************************************
   
  gif_font.c - utility font handling and simple drawing for the GIF library
   
  ****************************************************************************/
  
  #include <string.h>
  #include <stdlib.h>
  
  #include "gif_lib.h"
  
  /*****************************************************************************
   Ascii 8 by 8 regular font - only first 128 characters are supported.
  *****************************************************************************/
  
  /*
   * Each array entry holds the bits for 8 horizontal scan lines, topmost
   * first.  The most significant bit of each constant is the leftmost bit of
   * the scan line.
   */
  /*@+charint@*/
  const unsigned char GifAsciiTable8x8[][GIF_FONT_WIDTH] = {
      {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},    /* Ascii 0 */
      {0x3c, 0x42, 0xa5, 0x81, 0xbd, 0x42, 0x3c, 0x00},    /* Ascii 1 */
      {0x3c, 0x7e, 0xdb, 0xff, 0xc3, 0x7e, 0x3c, 0x00},    /* Ascii 2 */
      {0x00, 0xee, 0xfe, 0xfe, 0x7c, 0x38, 0x10, 0x00},    /* Ascii 3 */
      {0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00},    /* Ascii 4 */
      {0x00, 0x3c, 0x18, 0xff, 0xff, 0x08, 0x18, 0x00},    /* Ascii 5 */
      {0x10, 0x38, 0x7c, 0xfe, 0xfe, 0x10, 0x38, 0x00},    /* Ascii 6 */
      {0x00, 0x00, 0x18, 0x3c, 0x18, 0x00, 0x00, 0x00},    /* Ascii 7 */
      {0xff, 0xff, 0xe7, 0xc3, 0xe7, 0xff, 0xff, 0xff},    /* Ascii 8 */
      {0x00, 0x3c, 0x42, 0x81, 0x81, 0x42, 0x3c, 0x00},    /* Ascii 9 */
      {0xff, 0xc3, 0xbd, 0x7e, 0x7e, 0xbd, 0xc3, 0xff},    /* Ascii 10 */
      {0x1f, 0x07, 0x0d, 0x7c, 0xc6, 0xc6, 0x7c, 0x00},    /* Ascii 11 */
      {0x00, 0x7e, 0xc3, 0xc3, 0x7e, 0x18, 0x7e, 0x18},    /* Ascii 12 */
      {0x04, 0x06, 0x07, 0x04, 0x04, 0xfc, 0xf8, 0x00},    /* Ascii 13 */
      {0x0c, 0x0a, 0x0d, 0x0b, 0xf9, 0xf9, 0x1f, 0x1f},    /* Ascii 14 */
      {0x00, 0x92, 0x7c, 0x44, 0xc6, 0x7c, 0x92, 0x00},    /* Ascii 15 */
      {0x00, 0x00, 0x60, 0x78, 0x7e, 0x78, 0x60, 0x00},    /* Ascii 16 */
      {0x00, 0x00, 0x06, 0x1e, 0x7e, 0x1e, 0x06, 0x00},    /* Ascii 17 */
      {0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18},    /* Ascii 18 */
      {0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x00},    /* Ascii 19 */
      {0xff, 0xb6, 0x76, 0x36, 0x36, 0x36, 0x36, 0x00},    /* Ascii 20 */
      {0x7e, 0xc1, 0xdc, 0x22, 0x22, 0x1f, 0x83, 0x7e},    /* Ascii 21 */
      {0x00, 0x00, 0x00, 0x7e, 0x7e, 0x00, 0x00, 0x00},    /* Ascii 22 */
      {0x18, 0x7e, 0x18, 0x18, 0x7e, 0x18, 0x00, 0xff},    /* Ascii 23 */
      {0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00},    /* Ascii 24 */
      {0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18, 0x00},    /* Ascii 25 */
      {0x00, 0x04, 0x06, 0xff, 0x06, 0x04, 0x00, 0x00},    /* Ascii 26 */
      {0x00, 0x20, 0x60, 0xff, 0x60, 0x20, 0x00, 0x00},    /* Ascii 27 */
      {0x00, 0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xff, 0x00},    /* Ascii 28 */
      {0x00, 0x24, 0x66, 0xff, 0x66, 0x24, 0x00, 0x00},    /* Ascii 29 */
      {0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe, 0x00, 0x00},    /* Ascii 30 */
      {0x00, 0x00, 0x00, 0xfe, 0x7c, 0x38, 0x10, 0x00},    /* Ascii 31 */
      {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},    /* */
      {0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x30, 0x00},    /* ! */
      {0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},    /* " */
      {0x6c, 0x6c, 0xfe, 0x6c, 0xfe, 0x6c, 0x6c, 0x00},    /* # */
      {0x10, 0x7c, 0xd2, 0x7c, 0x86, 0x7c, 0x10, 0x00},    /* $ */
      {0xf0, 0x96, 0xfc, 0x18, 0x3e, 0x72, 0xde, 0x00},    /* % */
      {0x30, 0x48, 0x30, 0x78, 0xce, 0xcc, 0x78, 0x00},    /* & */
      {0x0c, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00},    /* ' */
      {0x10, 0x60, 0xc0, 0xc0, 0xc0, 0x60, 0x10, 0x00},    /* ( */
      {0x10, 0x0c, 0x06, 0x06, 0x06, 0x0c, 0x10, 0x00},    /* ) */
      {0x00, 0x54, 0x38, 0xfe, 0x38, 0x54, 0x00, 0x00},    /* * */
      {0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00},    /* + */
      {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x70},    /* , */
      {0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00},    /* - */
      {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00},    /* . */
      {0x02, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x00},    /* / */
      {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00},    /* 0 */
      {0x18, 0x38, 0x78, 0x18, 0x18, 0x18, 0x3c, 0x00},    /* 1 */
      {0x7c, 0xc6, 0x06, 0x0c, 0x30, 0x60, 0xfe, 0x00},    /* 2 */
      {0x7c, 0xc6, 0x06, 0x3c, 0x06, 0xc6, 0x7c, 0x00},    /* 3 */
      {0x0e, 0x1e, 0x36, 0x66, 0xfe, 0x06, 0x06, 0x00},    /* 4 */
      {0xfe, 0xc0, 0xc0, 0xfc, 0x06, 0x06, 0xfc, 0x00},    /* 5 */
      {0x7c, 0xc6, 0xc0, 0xfc, 0xc6, 0xc6, 0x7c, 0x00},    /* 6 */
      {0xfe, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x60, 0x00},    /* 7 */
      {0x7c, 0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0x7c, 0x00},    /* 8 */
      {0x7c, 0xc6, 0xc6, 0x7e, 0x06, 0xc6, 0x7c, 0x00},    /* 9 */
      {0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00},    /* : */
      {0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x20, 0x00},    /* }, */
      {0x00, 0x1c, 0x30, 0x60, 0x30, 0x1c, 0x00, 0x00},    /* < */
      {0x00, 0x00, 0x7e, 0x00, 0x7e, 0x00, 0x00, 0x00},    /* = */
      {0x00, 0x70, 0x18, 0x0c, 0x18, 0x70, 0x00, 0x00},    /* > */
      {0x7c, 0xc6, 0x0c, 0x18, 0x30, 0x00, 0x30, 0x00},    /* ? */
      {0x7c, 0x82, 0x9a, 0xaa, 0xaa, 0x9e, 0x7c, 0x00},    /* @ */
      {0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0x00},    /* A */
      {0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xfc, 0x00},    /* B */
      {0x7c, 0xc6, 0xc6, 0xc0, 0xc0, 0xc6, 0x7c, 0x00},    /* C */
      {0xf8, 0xcc, 0xc6, 0xc6, 0xc6, 0xcc, 0xf8, 0x00},    /* D */
      {0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xfe, 0x00},    /* E */
      {0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0x00},    /* F */
      {0x7c, 0xc6, 0xc0, 0xce, 0xc6, 0xc6, 0x7e, 0x00},    /* G */
      {0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0x00},    /* H */
      {0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x78, 0x00},    /* I */
      {0x1e, 0x06, 0x06, 0x06, 0xc6, 0xc6, 0x7c, 0x00},    /* J */
      {0xc6, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0xc6, 0x00},    /* K */
      {0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0x00},    /* L */
      {0xc6, 0xee, 0xfe, 0xd6, 0xc6, 0xc6, 0xc6, 0x00},    /* M */
      {0xc6, 0xe6, 0xf6, 0xde, 0xce, 0xc6, 0xc6, 0x00},    /* N */
      {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00},    /* O */
      {0xfc, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0x00},    /* P */
      {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x06},    /* Q */
      {0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0x00},    /* R */
      {0x78, 0xcc, 0x60, 0x30, 0x18, 0xcc, 0x78, 0x00},    /* S */
      {0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00},    /* T */
      {0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00},    /* U */
      {0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00},    /* V */
      {0xc6, 0xc6, 0xc6, 0xd6, 0xfe, 0xee, 0xc6, 0x00},    /* W */
      {0xc6, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0xc6, 0x00},    /* X */
      {0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x18, 0x18, 0x00},    /* Y */
      {0xfe, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xfe, 0x00},    /* Z */
      {0x3c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3c, 0x00},    /* [ */
      {0xc0, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x03, 0x00},    /* \ */
      {0x3c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x3c, 0x00},    /* ] */
      {0x00, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00},    /* ^ */
      {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff},    /* _ */
      {0x30, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00},    /* ` */
      {0x00, 0x00, 0x7c, 0x06, 0x7e, 0xc6, 0x7e, 0x00},    /* a */
      {0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0x00},    /* b */
      {0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0x7e, 0x00},    /* c */
      {0x06, 0x06, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x00},    /* d */
      {0x00, 0x00, 0x7c, 0xc6, 0xfe, 0xc0, 0x7e, 0x00},    /* e */
      {0x1e, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x30, 0x00},    /* f */
      {0x00, 0x00, 0x7e, 0xc6, 0xce, 0x76, 0x06, 0x7c},    /* g */
      {0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00},    /* */
      {0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x3c, 0x00},    /* i */
      {0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0xf0},    /* j */
      {0xc0, 0xc0, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0x00},    /* k */
      {0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00},    /* l */
      {0x00, 0x00, 0xcc, 0xfe, 0xd6, 0xc6, 0xc6, 0x00},    /* m */
      {0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00},    /* n */
      {0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7c, 0x00},    /* o */
      {0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0xc0},    /* p */
      {0x00, 0x00, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x06},    /* q */
      {0x00, 0x00, 0x6e, 0x70, 0x60, 0x60, 0x60, 0x00},    /* r */
      {0x00, 0x00, 0x7c, 0xc0, 0x7c, 0x06, 0xfc, 0x00},    /* s */
      {0x30, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x1c, 0x00},    /* t */
      {0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00},    /* u */
      {0x00, 0x00, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00},    /* v */
      {0x00, 0x00, 0xc6, 0xc6, 0xd6, 0xfe, 0x6c, 0x00},    /* w */
      {0x00, 0x00, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0x00},    /* x */
      {0x00, 0x00, 0xc6, 0xc6, 0xce, 0x76, 0x06, 0x7c},    /* y */
      {0x00, 0x00, 0xfc, 0x18, 0x30, 0x60, 0xfc, 0x00},    /* z */
      {0x0e, 0x18, 0x18, 0x70, 0x18, 0x18, 0x0e, 0x00},    /* { */
      {0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00},    /* | */
      {0xe0, 0x30, 0x30, 0x1c, 0x30, 0x30, 0xe0, 0x00},    /* } */
      {0x00, 0x00, 0x70, 0x9a, 0x0e, 0x00, 0x00, 0x00},    /* ~ */
      {0x00, 0x00, 0x18, 0x3c, 0x66, 0xff, 0x00, 0x00}    /* Ascii 127 */
  };
  /*@=charint@*/
  
  void
  GifDrawText8x8(SavedImage *Image, 
  	    const int x, const int y,
  	    const char *legend,
  	    const int color)
  {
      int i, j;
      int base;
      const char *cp;
  
      for (i = 0; i < GIF_FONT_HEIGHT; i++) {
          base = Image->ImageDesc.Width * (y + i) + x;
  
          for (cp = legend; *cp; cp++)
              for (j = 0; j < GIF_FONT_WIDTH; j++) {
                  if (GifAsciiTable8x8[(short)(*cp)][i] & (1 << (GIF_FONT_WIDTH - j)))
                      Image->RasterBits[base] = color;
                  base++;
              }
      }
  }
  
  void
  GifDrawBox(SavedImage *Image,
  	   const int x, const int y,
  	   const int w, const int d,
  	   const int color)
  {
      int j, base = Image->ImageDesc.Width * y + x;
  
      for (j = 0; j < w; j++)
          Image->RasterBits[base + j] =
              Image->RasterBits[base + (d * Image->ImageDesc.Width) + j] = color;
  
      for (j = 0; j < d; j++)
          Image->RasterBits[base + j * Image->ImageDesc.Width] =
              Image->RasterBits[base + j * Image->ImageDesc.Width + w] = color;
  }
  
  void
  GifDrawRectangle(SavedImage *Image,
                const int x, const int y,
                const int w, const int d,
                const int color)
  {
      unsigned char *bp = Image->RasterBits + Image->ImageDesc.Width * y + x;
      int i;
  
      for (i = 0; i < d; i++)
          memset(bp + (i * Image->ImageDesc.Width), color, (size_t)w);
  }
  
  void
  GifDrawBoxedText8x8(SavedImage *Image,
                const int x, const int y,
                const char *legend,
                const int border,
                const int bg, const int fg)
  {
      int j = 0, LineCount = 0, TextWidth = 0;
      const char *cp;
      char *dup;
  
      /* compute size of text to box */
      for (cp = legend; *cp; cp++)
          if (*cp == '\r') {
              if (j > TextWidth)
                  TextWidth = j;
              j = 0;
              LineCount++;
          } else if (*cp != '\t')
              ++j;
      LineCount++;    /* count last line */
      if (j > TextWidth)    /* last line might be longer than any previous */
          TextWidth = j;
  
      /* draw the text */
      dup = malloc(strlen(legend)+1);
      /* FIXME: should return bad status, but that would require API change */
      if (dup != NULL) {
  	int i = 0;
  	/* fill the box */
  	GifDrawRectangle(Image, x + 1, y + 1,
  		      border + TextWidth * GIF_FONT_WIDTH + border - 1,
  		      border + LineCount * GIF_FONT_HEIGHT + border - 1, bg);
  	(void)strcpy(dup, (char *)legend);
  	cp = strtok((char *)dup, "\r\n");
  	do {
  	    int leadspace = 0;
  
  	    if (cp[0] == '\t')
  		leadspace = (TextWidth - (int)strlen(++cp)) / 2;
  
  	    GifDrawText8x8(Image, x + border + (leadspace * GIF_FONT_WIDTH),
  			   y + border + (GIF_FONT_HEIGHT * i++), cp, fg);
  	    cp = strtok((char *)NULL, "\r\n");
  	} while (cp);
  	(void)free((void *)dup);
  
  	/* outline the box */
  	GifDrawBox(Image, x, y, border + TextWidth * GIF_FONT_WIDTH + border,
  		   border + LineCount * GIF_FONT_HEIGHT + border, fg);
      }
  }
  
  /* end */
  